Here is an indoor surveillance antenna used by the US Govt for monitoring VLF through 10GHz. These were usually placed above false ceilings and the antenna sits upright with the small dia end with coax connector pointing down. I have two of these and am selling my spare. I have experimented with these and they do receive HF, although a bit lower in level than a short passive tuned whip but on VHF/UHF and above they work great. These cost a fortune new and are rarely seen. This is a perfect VHF/UHF scanner antenna for the attic or for those who cannot have an outside antenna, or it can be weather proofed and used outdoors. I was able to track down the program manager for these and my version is the predecessor to the brochure in this link and has the same basic specs: http://forums.radioreference.com/scanner-receiver-antennas/130623-surplus-sri-discone-info.html#post970774

My camera distorted the shape of the antenna and its tapered about like a typical office trash can. Shipping will be via Fed-X ground to US address only please.